I really, really think that this should be brought up with the park.
If I had gone into a store like "Old Navy" and seen some workers on their cell phones I wouldnt care so much, but their JOB at an amusement park is to keep people safe. They are being payed to operate a ride and make sure that people are safe, and if they're good at their job, make people have a good time. I think the fact that a girl in the gift shop was sitting behind the register and that ride ops were talking on phones is absolutely inexcusable and those kids should not be working there if this is how serious they take a job like that. Those pictures should be forwarded to the park and those kids should be reprimanded both for hurting the park's wallet and their image.