When the baby is holding the Moe Howard key chain, there should have been a close-up of this prop in the baby's hand. The director forgot to film this, so the insert of the Moe Howard key chain is a jpeg taken with a digital camera.
The second time Berlyn walks into the amphitheater, there's a smudge on the
camera lens (visible on the far left of the screen). After a few seconds, the
smudge is covered by the shadows from the trees.
When Berlyn walks up the street to the Alto Nido Apartments, the assistant producer is talking to the cameraman in the background. If you listen carefully, you can hear "That's cool" and a few other words as the dog barks.