Continuity mistake: When Peter and MJ hug on Tower Bridge he gets some blood from his face onto the left shoulder of her jacket. From other angles there's no blood.
Continuity mistake: In the (phony) bar, Peter's straw goes from bendy to straight to bendy to straight in different shots.
Continuity mistake: After Spidey fights with Beck for the first time he gets a wound on his right cheekbone which is fresh, then dry, then fresh again.
Continuity mistake: When Beck and Peter are talking together on top of a building, their heads change positions several times between shots. From looking at each other to straight ahead and every other direction.
Answer: They are shown descending down from a satellite. It's reasonable to say they return to space when not in use. And also they can just encase themselves in more illusions to stay hidden regardless of where they go.
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