Other mistake: In the original version, a portrait of Bryce's family can be seen. Not only are the actors playing his parents completely different from the later episodes (which isn't necessarily an error, because actors for characters change in shows all the time), but Bryce is also shown to have a sister in the portrait. In later episodes, it is established that Bryce is an only child, so he doesn't have a sister. The portrait of his family is altered on the current streaming version on Netflix to show the new actors for Bryce's parents and remove the sister, but the DVD still has the original version.
Continuity mistake: When Hannah makes the list with names involving her past events, they differ substantially between the close-up when they're written and the final wide angle once the paper is finished. Check Alexander: first an irregular oval with a straight side, then a perfect oval.Sacha
Plot hole: When Bryce's body is found, there is a gaping hole in the back of his head, leading to speculation that he was shot. It is later determined that the hole was from blunt force trauma. However, when we actually see his death, he is simply pushed off the pier and ends up drowning. It wouldn't have been caused by his fight with Zach, as he would have been dead long before he could have been pushed into the water. And if the wound was somehow caused by aquatic predation, the forensics experts would know the difference between that and blunt force trauma.Phaneron