At the end, when Grace is running around the bases, she is shown running between first base and second base, then in the next scene she is still running towards first base.
As Chin Ho is describing the new computer system, his lips don't always match what we hear.
Early on, potential suspect Jacobson is shown to be 18 years old, judging by his birthday. However, not only does the character appear a little bit older, later on in the investigation, he is suggested to be in his 20's, mid-late 20's most likely.