Why don't employers call back?

I've applied to a few jobs and I have been interviewed. After the interview, I thought I'd be getting a call back. But I don't. Is this normal?

Very normal pre interview. Strange after interview. The excuse they use is: we have thousands of applicants and cant reply to everyone, but that doesn’t make it easier to accept.

The way I look at it is this: it’s a two way street and they have got to want you too, and if they don’t have the respect to get to you after interview, do you really want to work for a company like that?

I've applied to a few jobs and I have been interviewed. After the interview, I thought I'd be getting a call back. But I don't. Is this normal?

Most companies get back to you, even its just a quick email to say you havent got the job. Unfortunately it does sometimes happen though.
Its bit rude really when they dont, as they have narrowed it down to the X amount of people they want to interview, interviewed you etc. And you have taken the time to go to the interview (and tried your best). They may have had better candidates, but the least they can do is let you know that you werent successful.
I know at the initial applying stage, many dont get back to you unless they want to take things further (e.g. an initial chat over the phone, interview etc) as they can have a lot of applications. But if they have narrowed it down and actually interviewed you (and you have taken the time to go to said interview) then the least they can do is let you know.
Like i say, a lot of companies will get back to you, but unfortunately some dont. Ive had it done to me quite a few times.

Have you tried any mock interviews?

nope