Did I nail my interview? Or will I not be getting a callback?

Today, I went in for an open house for 16 Handles (a frozen yogurt company) and immediately, I was instructed to download an app on my iPhone in order to apply. Once I did, the man looking after me said "okay, --- will be with you in a second". Once he came, he asked questions such as "tell me about yourself" and I answered with my previous job experiences. Then he asked "how were those jobs for you?" and I said "I love working with people and I have a friendly attitude so I really liked the experiences". After, he asked about a difficult situation I may have encountered and I answered. Then, the major question… "Why 16 Handles?". I immediately answered "I looked around other places but this place really got me because I know you guys are associated with Trees for the Future and you help plant 16 trees a day. I think it's great how you contribute to the environment and I would love to be a part of the team". When he heard my knowledge and background on the store, he seemed impressed. Then, the general manager of the store (which whom I met previously when I was trying to apply. He's the one who told me about the open house) came in and said "you made it!" and we greeted each other. After this short interview, the man who interviewed me got up and told the general manager that I will be meeting with ---. The general manager said "yay" and high-fived me. When I went to get interviewed by the other man, he asked "tell me about yourself" so I answered the same as before. Then he said stuff like "we need people who are always smiling. Are you able to go to strangers and tell them how things work and such?" and ofcourse I answered "ofcourse, there's no problem with that". Then he asked my availability. After, he said "any questions for me?" so I asked "are the schedules flexible?" and "i heard there may be some difficult customers. Is that a frequent issue?". After, I got up and left. While I was leaving, people who were a part of the team were saying "bye" and knew my name.

Are these good signs? Was the interview too short? Please let me know!

Of course it is. They were interested in you. By you knowing about the companyvis also a plus shows them that you just didn't do a mass apply.

Cheryl, you gotta learn how to exist without fishing for compliments.

Honestly, I would have been a bit taken aback by your two questions. These are inappropriate for interview questions. Better would have been
"What hours are you looking to hire for?"
and not even mentioning 'difficult customers'. That's a big big no-no, unless it's a question from the interviewer to you.

Sounds like you nailed it… I can't believe even the lowest of jobs have hard interviews.

Congrads on keeping a good attitude!