Not necessarily a say, but they work with the admission office and talk about candidates with the office. Even something as simple as a guide being asked by an AO, “how did that tour go today?” and a response from the guide can be telling. “OMG it was great/they had awesome questions/we had a great time talking about XYZ/they were super excited when I showed them the robotics lab/etc” is a lot different than “eh, it was ok/they had no questions/ they seemed annoyed/bored /they made rude comments about XYZ”. It isn’t direct input BUT it IS input. It follows the philosophy surrounding “you should always be on your best behavior because you don’t know who is watching”. Think of it being no different than ripping an administrative assistant a new bum-hole in an email because she sends you a message that your interview had to be rescheduled. She may not have an overall or direct say in whether you get admitted but she can certainly let someone on the committee know about your rampage. Just because the one student here said his/her school’s guides have no say, doesn’t mean someone in the admissions office isn’t reading between the lines of your body language or casual conversations. It isn’t surprising a student would not have honed interview skills nuances, but remember AOs typically are very good at reading the room picking up everything in formal and casual conversations, body language, and even silence. So even if he/she doesn’t think they are giving input, they ARE. Don’t be naive thinking you can be a twat just because you aren’t directly in front of an AO 
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