Filler.

+ Bardock Movie.

Also if your gonna say Frieza told Goku he can't breathe in space, while he him self can. Either it is true, or he wouldn't want to tell his arch enemy that there's the slightest chance of hope for him to escape a planet that's about to explode thinking he has some hope to survive.

yes it is a filler. i wanted to point out that some mistakes in animes can happen, not that saiyans can breath in space. they cant.

Anime doesn't follow the normal laws of physics. They follow these ones.

The scene might have just been a part of promotion and not actually a part of the movie itself, considering most of the animation seems to have been made just for this in the first place.

The "they're still in the atmosphere" thing might have some degree of credibility since I've seen the idea used by other series. However, it's artistic license, as any object that far away from Earth might still be in the atmosphere, but you can't breathe in it. Or alternatively, Goku can just hold his breath really long or something. Whatever.

Go read the manga saiyans can breath in space except Goku.

Lol What? Sir, surely you jest?

No, Saiyans can do anything >.>

It could be possible that Goku didn't know he could breathe in space, and the only time he went in to outer space Mr. Briefs just built the ship for standard/advanced space cabablities and since he figured he couldn't breathe in space he gave him a space suit, Goku not knowing any different didn't have a reason to deny having the suit.

And Frieza could just be lieing.

Yep. They can all breath in space. They just choose to drive around in those nifty pods to pick up the space babes

Safe to say Birusu is a Beast.