In the "Winter" season of Click Clock Wood, Mumbo Jumbo leaves a note in his hut saying he's gone on vacation because he hates the cold. Yet, a few levels earlier in Freezee Peak (a snow world), Mumbo is seen occupying his hut to give Banjo a transformation.
Grammar mistakes in in-game subtitles.
In Mad Monster Mansion, the notes on the organ in Motzand's mini-game do not always correspond to the proper pitches.