In the episode where the Simpson's go to Florida they get arrested for killing the alligator. When the officer walks away Homer realizes that there's a set of key's that they can use to escape.

When they get out of the handcuffs all the Simpson's run into their car but when they first get into the car Maggie isn't there but then in the next scene while they are still in the car Maggie reapear's in the front seat right in the middle of Homer and Marge in her baby seat.