When Professor Traven shows Julius and Vincent the room that they were "created", there is an intravenous vial with clear liquid in it. If hypothetically that room hadn't been used since the Twins were born and there was an intravenous fluid from back then, it would be old and moldy. And if the room had been used recently, it still serves no purpose being there.
Julius Benedict:
My name is Julius and I am your twin brother.
Vincent Benedict:
Oh, obviously! The moment I sat down I thought I was looking into a mirror.
When Vincent is standing in front of Playmates club and pulls the guy off the motorcycle, the cable pulling the guy off the motorcycle is clearly visible.
The Title "Twins" appears with two "i" (one of them is smaller than the other one) referring to the appearance of the two main characters.
English
$15,000,000 (estimated)
$11,174,980 11 December 1988
$111,938,388
$216,614,388