What are the main warning signs in a Buddhist centre?

I have been to different temples/centers/monasteries from different schools, most of them I would return regularly, but in a few I found things that didn't agree with some personal views. I must say 100% of the time I found people with nothing but good intentions, but not always I agreed with the methodology, practices or some core believes, for example: Having a "cult style". That said, I would like to ask: What are the main "warning signs" (if any) we should look for when going to a temple for the first time? (I'm not talking about a simple visit, but Dhamma talks, classes and meditation). This question aims to help beginners, it is very hard to identify "unusual practices" when a person is just starting with Buddhism and have no idea what is Vinaya or the Suttas for example.