Other mistake: In the opening song, the dolphins sing: "If we could just change one thing, we would all have learned to sing", however the subtitles on the DVD say "lungs to sing". As a side note, dolphins do indeed have lungs.

The Hitchhiker's Guide to the Galaxy (2005)
1 other mistake - chronological order
Continuity mistake: When Ford is drinking in the bar, the amount of beer in his glass goes down mid-drink.

Trivia: In the planet construction facility, one of the planets resembles Douglas Adams's face.
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Answer: He's trying (very badly) to pretend that it's a weapon of some sort.
Tailkinker ★