Mimic

Mimic

Mimic

Dr. Susan Tyler

Dr. Peter Mann

Leonard

Josh

Remy

Dr. Gates

Ricky

Davis

Jeremy

Preacher

Yang (as Glen Bang)

Chinese Woman

Bag Lady

Skeletal Bum

Homeless Man

Workman

Subway Repairman

Homeless Woman

Long John #1

Long John #2

Long John #3

Bystander SWAT arrival (uncredited)

Subway Passenger (uncredited)

Homeless (uncredited)

Swat Team Leader (uncredited)

The escalator in Delancey Street subway station is shown as dismantled for maintenance because the scene was filmed on a Toronto subway station platform that was closed in 1966, so its escalator was removed (See also Thrill Seekers (1999)).

In the original ending Doctor Susan and the kid come up from the subway into Grand Central Terminal only to be confronted by hundreds of commuters dressed like Long John. This ominous ending didn't test well so the 'happy' street scene ending was shot and appears in the final cut.

Guillermo del Toro:  [insects]  Experiments on cockroaches.

When Susan goes into the abandoned subway office looking for Manny, she calls out "Chuy?" and not "Manny?" Chuy is hiding in the office, but at that point in the film she doesn't know it yet; she has no reason to expect to encounter Chuy and no reason to call his name. In fact, as far as we know, she shouldn't even know his name.

In the last scene where the male bug is struck by the train, you see it struggling to hold onto the front of the train for a while. It manages to hang in there for a little while before being pulled under and splattered everywhere. But when Dr Susan looks around the corner, after the bug is killed, she sees parts of the bug just meters away from where she was hiding. The bug should be further down the tracks, because it was dragged for ages before going under.

When Susan (Mira Sorvino) takes her pregnancy test, she and Peter (Jeremy Northam) move around and shake the test. This often results in false readings.

Susan Tyler: They mimic us. We mimic them.

Dr. Gates: Can I eat it or will it eat me?

Dr. Gates: Evolution has a way of keeping things alive.