(Short version: read the synopsis online if you have visual triggers - starting at 23 minutes, the rest of the show has flashing lights in all of the hospital scenes.)
Long version: There is a warning at the beginning of the episode about flashing lights, etc. 23 minutes into the episode, a character is prompted to have a seizure. It's stated in the show that it's about to happen so there's warning, but if you want to skip it, skip from 23 minutes (or just before that) to 24 and a half minutes. Or from 22 minutes to 24 minutes, to be safe. There's also more flashing images in the next scene with those characters, from 26 minutes to 29 and a half minutes. Basically, from when they induce the seizure to after the crash. There's flickering lights following that though, in the building scene. You may be better off just skipping the rest of the episode after they induce the seizure, to be honest (if you have epilepsy or visual triggers) and read a synopsis/summary of the episode online.
There's a high-pitched noise that hurt my ears in episode 5. It was from the radio. There may be some other times there are loud noises, though this was the one that bothered me most.