At the end, after they finish off Judge Doom, there is the scene where Roger Rabbit and Jessica head back to Toontown, complete with a reprise of "Smile, Darn Ya' Smile".

After that Porky Pig comes up and his his famous "Th-Th-Th-Th-That's All Folks!" line.

After that, Tinkerbell, from Disney's Peter Pan comes up and ends the movie.

WFRR? takes place in 1947.

Disney's interpretation of Peter Pan was not released until 1953.