The glyphs for this episode spell out: PETERS
Despite being named after his character, this is the first episode to not feature Joshua Jackson, apart for a small clip from a previous episode.
When the movie theatre from the alternate universe is seen, it is showing "Back to the Future: starring Eric Stoltz". In fact, Stoltz did play Marty McFly in Back to the Future (1985) for a few weeks. Michael J. Fox was originally unavailable, so Stoltz did some filming, but realized that the part was not right for him. By that time, Fox had become available and did the movie.
The majority of this episode is set in the '80s, so the opening theme was rearranged in an '80s style.
On the DVD commentary, Blair Brown says that to create her "1985" hairstyle for the flashback scenes, she brought in to the hairstylists some pictures of herself from Continental Divide (1981), and the hairstyle she had in that actual 1980s movie is the model they used to cut the wig for younger Nina's hair.