Please Don't Touch the Dinosaur - S6-E18
Continuity mistake: When Michelle turns the music on for them to dance, she lays the player down on the table on its side. It is then still in this position when Danny enters the room, however as he goes to turn the music off, it's suddenly upright without anybody having touched it.
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