In the beginning of the film, Alan Ladd's car runs out of gas and he parks it and walks a block before he is attacked by the gang. When the gang drives away, Ladd's car is no longer seen on the street.
When private detective Finney is chasing the gang, they are shown passing the same sharp corner to the left twice - first from Finney's car and then from the gang's car.
When Alan Ladd's character is in the hospital bed, he is still wearing his watch and a bracelet. It is highly unlikely that the hospital staff would have not removed them.
Chuck reads Sherill's address off his ID as "13 West Street, West Los Angeles." There is no such address in West Los Angeles. There is a 13 West Boulevard in Los Angeles, but further inland, in the Mid City area. The next closest 13 West Street is in Woodland, above San Francisco, over 400 miles away.