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.
Question: How did Marvin get the point of view gun to function the way it did (The front part popping open and firing a huge, wide-coverage blast)? That never occurred any other time the weapon was fired, and Marvin couldn't have known how to do it since they had recently discovered the gun.
Answer: Marvin does have a brain the size of a planet! He could have easily worked out the controls or directly interfaced with the weapon.
Sierra1 ★