Are these signs of that he's into me?

Okay, here we go. I work in a cafe and today there came a small bunch of steamy guys into it. I do admit that I like one of them and have done for a while, but not like I'm crazy about him or anything. I don't know him personally, we attend the same school and have few mutual friends, and I would not say hi to him if I'd see him somewhere. I have noticed him "noticing" me when I see him around and I know he knows very well who I am and I do likewise and I was like "Good morning, what can I do for you" and he went like "Morning, I'd like ___ and ___". And I was "Are you going to eat it here or take away" and he answered "Eat it here, no, I mean take way..." and I was like "Okay, anything else for you" and then he went to get a soda from the cooler and came back in a second and put it on the table and said "I'm also gonna take that" and his very hot friend added "Yes, take that and not gonna pay for it" and we all laughed a bit, hehe, since it was funny and they were hot. Than I told him how much it costed and he gave me his card, I withdrew the money from it, and then I put it on the counter in front of him with the receipt he had to sign on but he just took his food and started walking into the cafeteria, forgetting his bank card and also signing the receipt, and I was like, "Oh, you need to sign the receipt". This is the typical thing I would forget if I was all stressed out. So was I making him stressed or? Then his friend was like "Great job" to him and I tried not to laugh but I can imagine how embarring it must have been to him, but I thought it was sort of cute. And then I found out that they were still going to eat here but not take away and he had all his food in bags while the other guys had it on plates. I mean he's so adorable. And I'm not the hot girl everybody dreams about. I'm very normal but outgoing and fun. While they were sitting there I did notice them once looking but I tried not to look at them to not look stupid or some. What do you think about this?