OMG you're right! Good eye! Especially near the end, her wristwatch changes arms & the pole lamp changes sides - "Flopped" images.. Similar tricks in the car chase in "Bullitt", shot same scenes with multiple cameras from different angles, used same background cars over & over, etc.
How on Earth could he go so long without cumming? If this were me, she'd be having a discharge for days, I'd be putting pantliners (with wings) in her every couple hours -