Applied for the "Entertainment Tech" position online, and was told to call and schedule an interview. I called and scheduled for the next week. I received an email reminding me of my appointment, instructing me to dress professionally and come early. It also provided a description of the first interview, which it described as a "15-25 minute interview to determine if you meet the minimum requirements to be considered for employment."
When I arrived (20 minutes early), I was bombarded with paperwork, of which I had been given no notice. Furthermore, almost all of the information that I was asked to fill out, I had already filled out in my online application. What I had not been notified of in my online application was that there was an age requirement of 18 for my desired position. Not only did the online job listing not note this anywhere, but the online application system did not restrict me from applying. Because I had already driven 45 minutes out, I decided to apply for ride operations, instead. Regardless of any of that, the staff was friendly and helpful, double-checking my paperwork for common mistakes and helping me to correct them.
After my paperwork was completed and submitted, I was asked to take a 10-question math test (on which no calculators or cell phones are permitted; however, you may use the back of the test for scratch paper). All 10 of the questions were word problems, and they all related to transactions within the park ("If Fred buys 3 tries of a game at $2 each, and he pays with a $50, what is his change?"). The test was very simple, and I correctly answered all 10 questions.
After the math test, I was sent back to the waiting room to wait for an interviewer. I waited maybe 5-10 minutes. When my interviewer was ready (accompanied by an HR representative in training), we went back to the interview room and I was asked a series of simple questions. These included questions verifying that I met the minimum criteria ("Will you be willing to adhere to the grooming policy?"), questions about my interest in the position ("How did you hear about us?"), and situational questions ("If a customer becomes verbally upset, what should you do?"). My interviewer was very kind, friendly, and conversational, and when I answered the situational questions she would not in agreement and add on to what I had just said, and giving me more advice for handling the situation. She asked if I had any more questions, and I asked about ride operations (specifically, training and assignment). She deferred to the HR trainee (who was transferring from ride ops), who kindly walked through the process with me. My interviewer told me that there "was no reason why [I couldn't] move on to the next interview", so she gave me some more paperwork and asked me to fill it out in the waiting room while I waited for my ride ops interviewer.
The set of paperwork that I filled out was specific to ride operations. It included some information that I had already filled out 3 times, but it also included more specific ride operations questions, such as asking if I had any aversion to height, water, etc.
I waited probably 15 minutes after completing the paperwork for my ride operations interviewer, who was a very friendly and likeable person. He asked me about my interest in working at Six Flags, which brought up my theatrical interests. It turns out that he also shared an interest in theatre, and we chatted for a second or two about shows (I did one in high school last year that he directed in college). He was very friendly, and even told me a little bit about the Chart Toppers 2.0 show at Six Flags, which I had mentioned earlier in my interview. His questions that he asked were tailored more specifically to ride operations, and they were almost all situational. Many of them related to dealing with guests in abnormal situations (such as a ride closure or failure), but they were all simple questions that any level-headed person could answer. At the end, he asked "What makes you better than the next guy that I'm going to interview?". I re-hashed my interest in entertainment, which, I said, would give me a natural investment advantage over other applicants. He then handed me a few brochures regarding company uniform purchases, training, etc., and asked me to wait in the waiting room.
I went to the waiting room and waited for 15 minutes or so, until an HR representative came in, congratulated me on the job, and handed me a large informational packet to take home, fill out, and return.
All-in-all, my interviewers (and the other HR staff) were friendly and understanding, and weren't pressuring. The style of dress varied greatly from applicant to applicant, with one wearing a dress shirt and dress pants with a tie and others wearing basketball shorts and a t-shirt.
If you're confident, well-reasoned, well-prepared, and face no restrictions to entry (such as certain criminal history), you can expect a job offer.