Other mistake: They're meant to be on rebreathers (they recycle the air around the system, so you 'rebreathe' it), yet in the u/w scenes, it can be seen that they're on open circuit systems, i.e. conventional scuba, as they're venting exhaust gases. Rebreathers do not release bubbles in the quantities shown.
Sphere (1998)
1 other mistake
Directed by: Barry Levinson
Starring: Samuel L. Jackson, Dustin Hoffman, Liev Schreiber, Queen Latifah, Sharon Stone, Peter Coyote
Plot hole: The first time they communicate with the "entity" in the spaceship, they find a correspondence between numbers sent by the entity and letters of the alphabet. The entity presents itself as "Jerry". Later on, the entity tells Dustin Hoffman, "Stop calling me Jerry" - and then Dustin Hoffman realizes that the number-letter correspondence was wrong, and the actual name of the entity was "Harry". But if that is true, how could they have communicated without problems before? The very first word that the entity used was "hello", which would have to be displayed wrong, since it begins with an "h" and has an "e".
Alice 'Teeny' Fletcher: They're stingin' me through my suit.
More questions & answers from Sphere
Answer: He's also a psychiatrist, he's used to keeping calm while others are upset. But it is certainly possible he remembers it. Why not?
Grumpy Scot