The changing room is an interactive object in the menu of the game Hot Air Jr, found on the left side of the house, up the stairs.
The changing room is a normal tan-colored door that has a clothes hanger on it. It has a yellow pad on the bottom like the other doors that leads to levels.
The changing room is hidden and not on the main screen, unlike the other games in the Hot Air series, probably because Nitrome wanted it to be like an Easter egg; a reward for someone if they found it.
When the player lands on the pad, a face of a balloon appears and two yellow arrows come out. The player can then proceed to change the balloon to the next balloon, or the previous one. While the balloon changes, the driver in the balloon also changes his outfit.