In the final scene where Trepkos and Angel are fighting, the blood stain on Angel's shirt is on the left side. Later in the same scene the stain is on the right side.
The first shot, showing the exterior of Angel's office, establishes that it is nighttime. However, in the scene that immediately follows, when Angel, Cordelia, and Wesley talk to their client, Darin, there is visible sunlight behind the blinds and outside in the hallway. It is nighttime again when Angel leaves to question Ernie, the bookie.
(at around 1 min) When Angel is zapped by the cattle prod, it should singe his tank top, yet it doesn't leave a mark.
When Angel is first locked up with another demon, he tries to make conversation using a few languages. But he asks, "Hablo espanol?" which means, "I speak Spanish?" Additionally, the Italian phrase is incomprehensible but it certainly is not how you ask if one speaks Italian, which would be "Parli/a Italiano?"
When Angel goes into the sewer to find Jack. He is searching around. On the right side a light on a stand and a blue bag with paper is visible.
Angel is wearing a tank top through much of the episode so his tattoo should be visible, but is not.