In Halt and Catch Fire S4E09 Joe and Cameron are sitting in Comet office and they hear beeps. Joe explains that it is the alarm on Gordon's wristwatch coming from his office, adding that he doesn't know where the key to the office is.
There seems to be a contradiction.
In the last scene where Gordon is seen alive in the Comet office before dying, we can see him wearing his wristwatch just before leaving:
So, how and why did the wristwatch get into Gordon's office?