Other mistake: When we see the body of Liz Stride after her throat has been cut, the blood is bright pink. This may be due to the light shining on it, but it's still pink. (Surely by then, the blood would have turned brown after mixing with the oxygen?).
Other mistake: In the scene where The Ripper is with Liz Stride, she throws the grapes on the floor, and when she gets them, she sees the reflection of the knife on the water, which is physically impossible as The Ripper is backwards from her.
Other mistake: Towards the end of the film when Abberline is kidnapped, you see the carriage he is in cross a bridge over the Thames. In the distance (beneath one of the arches) you can see a tall illuminated building.