Factual error: When "some Frida Kahlo-looking asshole" is chasing Harley across the bridge during her close-up you can see that the cartridges are loaded backwards into the cylinder. (00:54:05)
Continuity mistake: The egg sandwich was not sliced, but when Harley opens one end of the wrapper, it has been sliced (with the sliced edge facing outward). When the sandwich flies in the air and lands on the street, there are four pieces of roll, which indicates it was sliced. However, when sandwiches are sliced in half, the half is not turned around like it was when Harley first opened the wrapper and was about to take a bite. (00:13:08 - 00:15:46)
Continuity mistake: In the scene with the sprinklers in the prison Harley gets soaked. She walks into a different room and suddenly she's completely dry.
Suggested correction: She's actually completely wet in another room, she just dries too fast in the process of fighting.