In Incredibles 2, the Supers are:
forced to wear hypnotizing glasses.
The Incredible kids pick up on this right away but no one in the general public seems to.
Since this is so incredibly obvious, there's probably a reason why not. What is it?
Winston does pick up on this when the Supers walk out for the signing on the ship.
He asks Evelyn something along the lines of, "What's with the new masks?"
To which Evelyn replies, "Yeah, they've got night vision."
The quotes are not exact just from my memory, but the point is what counts.
Being that Evelyn is the tech guru, it wouldn't seem out of the ordinary for them to receive new tech upgrades. Also, remember the kids already know something is amiss because Bob has to go rescue Helen.
The Incredibles kids also realize this because they witness Frozone, who was trying to help them escape the hench-heroes in "The Incredibile", suddenly change sides and start attacking them as soon as the goggles are slipped on him. That's a pretty clear cause-and-effect, even for Dash.