Factual error: In the scene when The Wasp (Hank's wife) goes subatomic to deactivate a missile, you see the missile flying horizontally in the clouds. That is not possible. First, that missile does not have wings so it simply could not fly horizontally like an airplane. Second, Hank states it's a ICBM (Intercontinental Ballistic Missile). ICBMs have a circular trajectory with apogee at 1200km of altitude (750mi), WAY above the clouds.

Ant-Man (2015)
1 video
Directed by: Peyton Reed
Starring: Michael Douglas, Paul Rudd, Evangeline Lilly, Corey Stoll
Continuity mistake: Cross is holding a normal striker fired (no external hammer) Glock handgun against the head of Ant-Man. In order to save his life, Hope orders the ants to block the firing mechanism of the gun, and they block a suddenly-visible hammer on the Glock. (01:26:00 - 01:27:00)
Hank Pym: Scott, I need you to be the Ant-Man.
Scott Lang: One question... Is it too late to change the name?
Question: SPOILER: When Scott invades the helicopter to stop Cross, Cross appears in the Yellowjacket armour. The Yellowjacket armour before this was placed inside glass casing and was miniaturised. My question here is, how exactly did Cross get the Yellowjacket armour to human size before putting it on?
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Chosen answer: The suit was built human-size and then shrunk using Pym particles. The same technology can also be used to grow objects. Cross was shown to have a hand-held device earlier in the film capable of shrinking, so he either used this device, or activated the suit's built-in growing/shrinking technology.