The photo of Jerry with the screwdriver was on the roll George had developed earlier on, not on the same roll as his naughty pictures.
When Jerry is talking to Uncle Leo on the phone and telling him to open the package (containing Jerry's broken stereo), the stereo is clearly visible in the background, intact and in Jerry's apartment.
When Jerry and Kramer are arguing about "write-offs" and examining the broken stereo Jerry's stereo can be seen in the background all in one piece.
When Kramer is taking George's pictures there is a floor standing photography light in the background. In the photo shown later the light is not there.
When Jerry (Jerry Seinfeld) says no to Newman (Wayne Knight) asking for a sip of his root beer, the can in his hand is dangling, but in the next shot the can is on the desk.
Elaine is told she shouldn't be looking at her medical chart, and has to resort to sneaking her medical records out of her doctor's office, which gets her into trouble. New York state law requires all health care practitioners and facilities to grant patients access to their own medical records upon request.
She is also surprised to see her record show up unexpectedly at her new doctors office. It would be illegal for medical professionals to exchange information without her consent.
Jerry files a claim with the Postal Service for the stereo having been broken in transit, but there are many errors. The parcel has no return address, and the unknown sender would have insured it, and only the sender can file a claim, as they paid for the insurance, not the recipient.
Uncle Leo signed off on receiving the package as "Uncle Leo". In reality, anyone receiving or signing off on a package needs to use both their given name and surname.
While Kramer examines the camera he will use to take George's pictures he triggers the telephoto lens. Hen then starts snapping away with the lens still in telephoto position so he's actually produce closeups of George's nostrils not full body shots as revealed later.
Kramer (Michael Richards) wears the same shirt that he previously sold to Kenny Bania (Steve Hytner) in episode 6.9, The Secretary (1994).
It is against a doctor's Hippocratic oath to turn down someone in need of medical care.
Kramer (Michael Richards) borrows a camera in this episode but in The Pick (1992) we saw he had his own camera to take a picture of Elaine (Julia Louis-Dreyfus).