Look closer.
In Hercules, the rug that Hercules wears is actually the body of Scar from The Lion King.
Walt Disney Pictures
In Prometheus, David the android's fingerprint includes the Weyland Corporation logo.
20th Century Fox
When Hans Landa is investigating the farm at the beginning of Inglourious Basterds, he subtly checks the pulse of one of the daughters to see if she's hiding something.
Universal Pictures