After the church burns down, Samantha talks with Trudy in a bank. Behind Trudy and her co-worker is a door with a nameplate, reading Kathy Saques. The scene cuts back to Samantha, and then to Trudy and her co-worker again, where the nameplate is then blank. It subsequently returns to being filled out again after another cut.
Sam has obtained a new edition of the Philosophy of Time Travel book without her late brother's help, as he never got the book in the "new" timeline. We don't know how she got it, because that detail is not relevant to this story.
The movie is set in Summer 1995, but we see movie announcements, car models, and currency units which didn't exist at that date. This is in keeping with the movie's themes of time travel and altered reality.
At the end of the movie, when they are examining the meteor crash site, Officer O'Dell picks up Iraq Jack's dog tags with no damage to them. The meteor would have at least left some burn marks on the tags.
at 11:22, at the motel, Sam notices the pamphlet on the wall about missing boy Billy. It reads Date Missing 06/12/1995, Age at disappearance 9 years 5 days, Date Printed 06/14/1995, Print Date Age 9 years 2 days. How can the boy's age reduce 3 days after 2 days have elapsed since disappearance when the pamphlet was printed? That 9 years 2 days should have been 9 years 7 days.
When the character Randy is putting prices on cans in the store,
the Campbell's soup cans are pop top cans. Pop top soup cans didn't appear until 2000.
Although the film is supposed to take place in the early 90s, several post-2000 model year cars can be seen as Randy and Sam bike through the town.