When Suicide does his initial snowboard run he is above the clouds. After descending the slope a ways we see he is clearly below the clouds. At one point he stops and is back above the clouds again, then restarts his run with next frame showing him far below them.
During the 'Sea Cruise' Free-For-All one girl (in the white snow suit with pink marks and wearing pink glasses) can be seen singing with Ice only twenty seconds AFTER you see her doing the splits as she skied down the slope. It would take at least several minutes to get back to the top from the bottom of the slope indicating either the song was recorded FIRST and the ski session later or the editor cut the tape in the wrong order.
During the entire film we assume this is during the christmas season during a blizzard season yet in hardly any of the scenes are the characters breath being shown while breathing indicating that the weather wasn't really cold during filming..
In the last few minutes of the film the characters Stanley and Tiana are riding together within a convoy of snow machines when Stanley hears calls for help. To get Tiana to stop and pull over he mistakenly calls Tiana by her real name, "Tess", he says. In his next line Stanley clearly calls her Tiana as he should.