When Shirley is talking to Max at the open casket, her right hand goes from being on and off his left arm between shots.
One of the flashback scenes show a plush version of Duffy the Disney Bear on a sofa behind Shirley. Duffy would not have existed until 2002.
Elizabeth Reaser looks directly into camera in between 14:00-15:00 minute mark.
The pyjamas Shirley wore in one of the flashbacks was an American Girl brand outfit, specifically the one made to tie in with the Maryellen doll. Maryellen and her collection wouldn't be introduced until 2015.
Hugh says "It's been a minute since one of your color storms" to Olivia. This usage of "it's been a minute" didn't enter the vernacular until the late '00s.
The intake worker at the rehab says she needs a UA and explains that it is a urine analysis. The correct way to say it would be urinalysis, all one word, not two words.