When the workers come to the facility in the morning (some after 8 am, as the main character was woken up at 7:35 am), the sun is shining and their shadows are to the right. When they leave, and a clock shows it's past 6 pm, their shadows are still on the right.
The first time Barry comes to the office, his computer monitor is in a raised position. The second time, on the bounce/repeating day, when Barry gets to his desk the computer monitor is in a lowered position. Since the day is repeating, the computer monitor should still be in a raised position.
About 27 minutes into the movie, we see a shot of a newspaper article bearing the headline "TIME BOUNCE THEORY POSSIBLE THREAT", sub-headed "Scientists Predict Experiment Could Cause Time to Repeat". The shot is clear enough that we can clearly read the main article text, which has nothing whatsoever to do with the headers or with anything happening in the movie. The article text simply consists of the following bit of text repeated over and over again: "For a new practice complete a documentary on Los Angeles dance pioneer Lester Horton, one of his former company members is searching for archival footage as well as presenting a dance performance as a fund-raising benefit. As the new times"
During the chase, the skid marks from a previous take are visible on the pavement in the foreground.