Lets take a look at signs that indicates that you have had a good interview!!
1- The interviewer interested in what you saying during the interview,
2- The interviewer or the employer polite, listen carefully, sits up and care about what you saying..
3- The person whoever interviewing you is asking nice questions, all the questions are good and none of them trying to make you feel failed.
Related: How to stay calm in a job interview
4- The interview is taking longer than any other normal ones – lets say more than 30 minutes.. wow you got the job!
5- You have already introduced to other people who works there but don’t forget this is not they showing you the work-place, they do it to everyone probably.
6- If you are having a good interview than they would answer your questions patiently, they would talk about duties, hours etc.
7- The interview would be keep looking at the time IF YOU ARE HAVING A BAD INTERVIEW… if she or he looking at your face rather than anything else can be meant that you are on the right way.
8- The interview would talk about the job rather than asking you questions about your skills etc.
9- They would ask about references – this would indicate that they have already decided about you.
10- They wouldn’t answer phone calls or wouldn’t let anybody in during the interview if she or he thinks that you are a the one who they would employ.
11- If the interview is going good than they would ask about hours and shifts and when can you start working.
12- Salary expectations would be asked and talk about it.
13- "we will ring you soon" if you heard this then it might be a good sign of an interview went well. This is very different than "we will call you"
14- Look at the interviewer’s face and eyes, you will probably understand what he /she thinks about you.
15- They will give you a date for a second interview is a very good sign of a good interview.
16- The interviewer is pretty warm and smiles when shaking your hand saying see you soon!!
Related: What does my body language tell my interviewer?
Would you like to add your signs, please feel free to post to this topic.