As Mannix was going down the embankment after being forced off the road, looking from the inside of his car the hood was tan with no hood scoops. But Mannix's car is dark green with hood scoops.
When Mannix's car was shot at a bullet mark was made on the side of his car, but in the next view it was gone.
When Mr. Mannix breaks down a door, the wall moves visibly - rather like a temporary set wall instead of a solidly built wall holding a heavy door.
Studio lighting equipment can be seen reflected in the champagne glass when Mannix is inspecting it in Lt. Malcolm's office.