"Also the regular call outs of "you need to be XXX feet" as you pass XYZ etc were somewhat distracting. "
This is another area which can be covered in a pre-flight briefing. It is getting into multi-crew operations and of course, in a multi-crew operation one would expect to have SOPs defining who says and does what and when. If you are going to allow the other pilot to participate you both need to be clear who is doing/saying what.
A pilot making an unexpected call out is a serious problem because it causes the pilot flying to break his concentration and attend to the call out; he may even have to ask supplementary questions to understand what he is being told and thus the period of distraction from the primary task can be quite long.
At critical phases of flight in a multi-crew operation they have the "sterile cockpit" principle which prohibits any non operational and non standard discussion during these times. You could brief the non flying pilot (and indeed passengers) in your single crew operation to respect this principle.
Happy landings
3 Point