At 1:25 into the film, Mira goes from putting her head against the wall in frustration at Suzy's reading the end of Rob's article about her texts to her deceased fiance which Rob had received on his "new" work cellphone. Then when they change POV angles her head is straight up, only to go back to still being against the wall when switching the POV back.
In the beginning of the film, Rob refers to the Celine Dion song as "My Heart Still Goes On," when the title is actually "My Heart Will Go On."
When Mira finally sees her texts to Rob on his computer, the name "Mira" is visible on the screen at the beginning of the texts. But when Rob walks into the room and shows her his cellphone, only Mira's phone number is visible at the beginning of the texts.
When Rob is in the park at night, as the band ends playing, Rob stands up from sitting on a chair; the boom mic is visible in the top left of the screen. The time stamp is 1hr 30 minutes and 20 seconds. Or, 13:55 minutes left in the movie.
In the park Rob gets up from his chair at 1:30 minutes into the film; the boom mic is visible in the top left of the frame.
When Mira and her sister are playing Scrabble, Mira spells out 'sad' and says it's only five points, but the tiles add up to only four.