Press the mute button on a particular track, so that when you next play the song back, that track is excluded from the playback. Press the mute button again to deselect the function and bring the muted track back into the mix.
If you only want to hear one specific track, use that track's solo button on the mixer. This function plays the track on its own. To play a second track alongside your soloed track, use that track's solo button. Complete the required mixing work on your soloed track and deselect all of the solo buttons you have activated to bring back the elements you have excluded.
If when listening to your mix, you hear an unwanted sound, but cannot work out where it is coming from, solo the first track on your mixer at the relevant point in the song and listen for the bug. If this track is not the culprit, unsolo it before soloing the next track. Repeat this operation until you find the track containing the rogue sound. Edit out the blip if possible; if not, rerecord or replace the track in question.