One actually has three opportunities to confirm their vote display.
1) The actual selection for the individual race
2) A summary of all your votes on the screen that shows your selections and then you can make corrections by selecting the race in question.
3) The printout of your choices prior to your "Cast Vote" selection, where you still have the opportunity to make changes
The touch screens can be very sensitive to light pressure, I'm not sure of the technology as to whether it's pressure sensitive or relies on "capacitance" similar to how some elevator buttons work.
It should be noted that most of the workers on the early voting teams are NOT regular county employees, but apply for what is actually a temporary job. My wife worked on early voting teams for about 3-4 years and she never saw any "funny stuff" going on. I can assure you that she is a conservative republican. She was always commenting on how various unions would arrive at a site and unload a whole group of voters who had their marching orders on how to vote, she thinks that is the real problem. Now the team leads at the various locations are full time county employees and some of them may not work in the election department, so it's possible that these folks are SEIU members.
My own take is that while it is possible that there are some shenanigans going on because one never really knows, I think that there is really nothing sinister going on. The ultimate responsibility is for the voter to check their selections at the opportunities mentioned above and pay careful attention to what you are doing. Don't be a Florida voter that gets confused by butterfly ballots and the like.
I was disappointed that Mr. Lomax stated that they had resolved the problems that were reported in Boulder CIty but never went into detail as to what they were or how they were fixed.