There’s more here that points to the lake/crash as important. Before Irv goes to the phone booth, we see him walking out of an apartment complex called Leonora Lake. Now, as any good English major (raises hand) will tell you, this is a reference to “Leonore” by Edgar Allen Poe, about a grieving husband who believes he’ll meet his dead wife again in the afterlife. Pair “Leonore” with “lake” and you’ve got a tidy, little subconscious package that can’t be ignored.
One more piece of evidence that I’m not sure even I buy: We see Ms. Cobel/Selvig’s car in the driveway multiple times, and then at the end of the episode when she almost runs Mark over. Am I alone here, or does it look an awful lot like the white car in the lake in the opening credits? Could this be Ms. Cobel trying to tease out Mark’s memory? Does she own Gemma’s post-crash car which she brought back to life (much like Gemma herself)? Or am I grasping at straws, and all cars just look like vintage Renaults in the town of Kier? Only time—and obsessive rewatches—will tell.