When Mandy pulls the partial print from the .25 shell casing, it has a clearly defined whorl pattern but when it is scanned into the computer by Catherine, it becomes a smudge of lines with little obvious minutia.
When Catherine is testing the fingerprint on the bullet to find out if it belonged to McKeen, she brings up a computer screen with biographical information that gives McKeen's birth date as 6/28/55. Then she switches to a different screen and now the birth date for McKeen is 01/13/56. His weight also changes from 190 to 203, but maybe that's just an update due to a weight gain.
When Mandy is printing the bullet from the gun and right before Catherine asks her to leave her lab, a strand of her hair goes from being tucked behind her ear to not being tucked behind her ear in between shots.
At 13;35 Brass unties his tie and then at 13:41 he unties the same knot again.