An amateur wouldn't bug a telephone, because modern telephone are difficult to bug. Old-style pones (with removable mouthpieces) can be, but most modern phones are one-piece moulded plastic.
Hidden cameras are possible, but are difficult to hide effectively in someone else's home; for example, you'd notice if someone replaced your clock radio, or a smoke detector appeared in your bedroom one day. While it's possible that the camera was in place before you moved in, it's not very likely and there's multiple technical hurdles that would need to be dealt with.
In addition, one would rationally think that your landlord isn't going to go to all the trouble and expense of installing hidden surveillance equipment in your home and then blow his cover by bringing up things in conversation. How specific was the subject you were discussing over the phone? It's possible that he was referring to something unrelated and you misinterpreted that in your nervousness. Alternately, it may be as ASU2003 said; perhaps one of your roommates innocently let a couple of things slip?
I'm not going to say that it's impossible that your being watched, just that it's unlikely. There's no reason for your landlord to do so, and it's not as easy as the spy movies make it out to be.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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