When Ronnie and Professor Stein separate near the end of the episode, the quantum splicer is missing from Ronnie's chest.
Dr. Stein refers to the Oxford University Press as a publication. It's actually a publishing house.
After Ronnie and Dr. Stein's brainwaves are examined, Dr. Stein removes his headset, yet the monitor still shows his brainwaves.
While Barry and Linda are on the phone, "Answer" and "Ignore" can be seen on Barry's screen as if he had never picked up the phone on the first place.
When Eiling has the gun to Stein's head, Ronnie detects this and tells Barry. The gun was not touching Stein's head, and so Ronnie should not have been able to know this.
Barry zips out to fetch Martin a pizza, returning instantaneously, which he couldn't have done unless he stole a pizza from somewhere, which seems a little outside his moral character. (Even if he swiped it and left money behind, someone's out a pizza, and a deliverer could be out a tip or, at worst, his/her job; and, a pizza parlor, depending on its promos, could be out the price of a pizza for late delivery.)