Continuity mistake: In the earlier scenes on the planet's surface when the men still have their helmets on, it appears that the cameramen were also wearing space suits so that they would appear as crewmen on the visor reflections. Still too many people visible though.
Continuity mistake: In every view of the front of Mars 1, you can clearly see the landing pod still attached, even when it's on Mars' surface.
Continuity mistake: 15 minutes into the movie, as the crew sits at a table to discuss frogs and the environment, there is a white bottle cap with a red dot on it in front of Carrie-Ann Moss. During the discussion the cap keeps changing right side up and upside down as the cameras change views.
Continuity mistake: If you look at the back of Mars I, the "wings" that come out at the back change position. In one shot, they are in a typical five point star, then in another shot, they are in a six point star configuration with the one to the bottom missing.
Chosen answer: They aren't given a name. They act like plants, except instead of absorbing carbon dioxide and expelling it as oxygen, they eat plants and release oxygen from their bodies. It's probably more effective than using plants since they weren't expecting to be able to breathe on the surface.
Knever