Revealing mistake: When Joey sees his girl (again) in the water and rushes out to hug her (and she disappears again), there's a large brick home visible in the background, on their "deserted island." (00:13:35)
Misadventures in Baby-Sitting - S3-E14
Revealing mistake: The kid that D.J. Is babysitting gets his head stuck in the railing - the rail to the right is obviously a removable piece.
Chosen answer: The first time was in the first season, episode 19 "The Seven-Month Itch", the second was in the fourth season, episode 1 "Greek Week", the third time was in the fifth season, episode 19 "The Devil Made Me Do It" and finally in the very last episode of the series, "Michelle Rides Again", season 8 episode 23.
jennibee