When the hold-up man first enters the mini-mart, he racks the shotgun, but no shell is ejected, meaning the gun is now loaded and ready to fire. The shotgun is not fired during the course of the robbery. Dex then takes the shotgun away from him, racks it again, then points it at him. No shell was ejected when she racked the gun, meaning the robber entered the store with an empty shotgun.
After the robbery, the store clerk gives Dex the bottle of beer she was going to buy. She takes it, without a bag, and walks out, before dropping it. Even in Portland, it is illegal to carry an unbagged beer out of a store.
Hoffman's partner tells him they have a 'scene' at the Fremont Bridge, but when they examine the body, they are standing on the east bank of the Willamette River, under the Hawthorne Bridge.
When Dex is tracking Ansel's phone, her phone announces that they are on 11th Blvd. There is no 11th Blvd. in the Portland area, only 11th Street.
While Dex is tracking Ansel's phone, it is reported as being on Burnside St., then on North Willamette Blvd. with no turns between them. These two streets have no intersections, and are in different parts of Portland. In addition, when the GPS voice tells Dex the phone is on N. Willamette Blvd, the map on her phone shows it to be on SE 43rd St at SE Woodward, which is a real intersection, but it doesn't look like the one depicted.