Simpsons in South Park
Simpsons Already Did It - http://ipodpspmovietv.weebly.com/south-park-simpsons-already-did-it.html

Professor Chaos (Butters) struggles to find an evil scheme that hasn't already been done on The Simpsons.Butters reaction when he learns that "The Simpsons already did it" mimic Matt and Trey's own reaction when they think of a good idea, then realize that the simpsons did it already, leaving them with random ideas
Cartoon Wars Part 2 - http://ipodpspmovietv.weebly.com/cartoon-wars-part-2.html

Bart Helps Cartman Cancel Family Guy.According to Parker and Stone, following the airing of Part 1, they were contacted by the producers of both The Simpsons and King of the Hill, praising their work. This inspired the addition of Bart Simpson as a character in this episode of this two-part episode as well as a brief scene in which the King of the Hill animation staff can be seen in the background
Family Guy in South Park
Cartoon Wars Part 1 - http://ipodpspmovietv.weebly.com/cartoon-wars-part-1.html
Cartoon Wars Part 2 - http://ipodpspmovietv.weebly.com/cartoon-wars-part-2.html

Cartman begins a one-man crusade to get "Family Guy" taken off the air after it shows an image of Mohammed.As a matter of fact (or irony), Comedy Central refused to air an image of Mohammed, which would have been shown in the "Family Guy" episode within the show.
South Park in The Simpsons
The Bart of War - http://ipodpspmovietv.weebly.com/the-bart-of-war.html

Bart and Milhouse watch South Park.Also In This Episode: Marge makes Bart quit hanging out with Milhouse after the two are caught invading the Flanders' home
Family Guy in The Simpsons
Treehouse of Horror XIII - http://ipodpspmovietv.weebly.com/treehouse-of-horror-xiii.html

Homer creates an army of clones of himself that are each progressively dumber than the real Homer. One of the clones is shown to be Peter Griffin.Also In Thsi Episode: gun-wielding zombies attack Springfield after a ban on firearms And Scare Harms and The Simpsons are trapped on an island where people are transformed into animals.
The Simpsons in Family Guy
PTV - http://ipodpspmovietv.weebly.com/ptv.html
the opening is a parody of the Naked Gun movies, with Stewie on a tricycle, at the end Homer Simpson is being chased into his garage as in the opening sequence to The Simpsons.Also In This Episode: Peter gets an idea to start his own cable network.
The Juice is Loose - http://ipodpspmovietv.weebly.com/the-juice-is-loose.html
Mayor Adam West is seen talking to someone off the screen and leads the viewer to think he is talking to OJ Simpsons, who is in the town, when he says: "We don't want you in our town Simpson. We don't love you like we did back in 1993... The screen cuts to Homer Simpson who says his trademark "D'oh".Also In This Episode: Everyone is up in arms after Peter becomes friends with O.J. Simpson.
Simpsons Already Did It - http://ipodpspmovietv.weebly.com/south-park-simpsons-already-did-it.html

Professor Chaos (Butters) struggles to find an evil scheme that hasn't already been done on The Simpsons.Butters reaction when he learns that "The Simpsons already did it" mimic Matt and Trey's own reaction when they think of a good idea, then realize that the simpsons did it already, leaving them with random ideas
Cartoon Wars Part 2 - http://ipodpspmovietv.weebly.com/cartoon-wars-part-2.html

Bart Helps Cartman Cancel Family Guy.According to Parker and Stone, following the airing of Part 1, they were contacted by the producers of both The Simpsons and King of the Hill, praising their work. This inspired the addition of Bart Simpson as a character in this episode of this two-part episode as well as a brief scene in which the King of the Hill animation staff can be seen in the background
Family Guy in South Park
Cartoon Wars Part 1 - http://ipodpspmovietv.weebly.com/cartoon-wars-part-1.html
Cartoon Wars Part 2 - http://ipodpspmovietv.weebly.com/cartoon-wars-part-2.html

Cartman begins a one-man crusade to get "Family Guy" taken off the air after it shows an image of Mohammed.As a matter of fact (or irony), Comedy Central refused to air an image of Mohammed, which would have been shown in the "Family Guy" episode within the show.
South Park in The Simpsons
The Bart of War - http://ipodpspmovietv.weebly.com/the-bart-of-war.html

Bart and Milhouse watch South Park.Also In This Episode: Marge makes Bart quit hanging out with Milhouse after the two are caught invading the Flanders' home
Family Guy in The Simpsons
Treehouse of Horror XIII - http://ipodpspmovietv.weebly.com/treehouse-of-horror-xiii.html

Homer creates an army of clones of himself that are each progressively dumber than the real Homer. One of the clones is shown to be Peter Griffin.Also In Thsi Episode: gun-wielding zombies attack Springfield after a ban on firearms And Scare Harms and The Simpsons are trapped on an island where people are transformed into animals.
The Simpsons in Family Guy
PTV - http://ipodpspmovietv.weebly.com/ptv.html

the opening is a parody of the Naked Gun movies, with Stewie on a tricycle, at the end Homer Simpson is being chased into his garage as in the opening sequence to The Simpsons.Also In This Episode: Peter gets an idea to start his own cable network.
The Juice is Loose - http://ipodpspmovietv.weebly.com/the-juice-is-loose.html

Mayor Adam West is seen talking to someone off the screen and leads the viewer to think he is talking to OJ Simpsons, who is in the town, when he says: "We don't want you in our town Simpson. We don't love you like we did back in 1993... The screen cuts to Homer Simpson who says his trademark "D'oh".Also In This Episode: Everyone is up in arms after Peter becomes friends with O.J. Simpson.