When Pest is having his toast with Gustav, and is presented with his weapons, the camera cuts back and forth between Pest and Gustav. Sometimes when the camera is on Gustav, you can see it is raining, even though in other shots it is a sunny day.
After the shower, John is dancing to his closet. After he throws off his towel, the camera goes to his feet and you can see the towel is still on his body.
In the scene where Pest's Chinese boss is walking him to the office phone, Pest's hair is messy and bushy, but when he turns around and into the phone booth, his hair is perfect again.
When Himmel throws up on the Pest's face, it's covered with vomit. He turns away and then turns back with a perfectly clean face.
When Pest is at Gustav's for the first time, he has a cigar in his left hand. In the very next shot, it has jumped to his right.
When Pest is at Zantha's house his tracking device placed on his person heats up and shorts out due to moisture, yet after escaping on the boat with Himmel, Pest swims to shore/the pool party and then at the pool party swims in the pool.