Perry had appeared in episodes before this, but in this episode, he was considered a new guy.However, it is shown in a later scene when Robot tries to make Perry 'unhappy' by taking his car's wiring out, suggesting that Perry ethier bailed it out so it could be fixed or bought a different one of the same color. At the beginning of the episode, Gart said that Perry's car was towed away and destroyed.Fourth wall break: At the end of the episode after Robot g ets injured by his unhappy ray, Perry looks at the camera and says 'That made me kind of happy'.Ogo is shown to be an expert in Gregorian chanting.In this episode, Robot tears out his car's wiring, causing it to explode the second time Robot vomited into its compartment in Game Boys the third time Marf attacked it and it is run over by a steamroller with Perry still in it in How to Train Your Marf. This is the first time Perry's car has been ruined/destroyed.It is revealed that Perry's constant smiling is due to his facial gears being broken.Monster's horns are shown to shift down when he's depressed.This is the first time a musical number is performed.Although Perry first appeared in the first episode of the show, Monster's Great Escape! (cameo in the background), this is the first episode to mark him as a major character.Robot takes it upon himself to help his friend regain his smile.

When Robot and Monster discover Perry, a Mechanical co-worker of theirs, always seems to be smiling, Monster is distressed that he may no longer be 'The Happiest Guy in the World'.

Come on get happy