1) I would say that they should have come together and discussed the play. Especially since they had different calls. First is sounds like they might have had a differing opinion of where the ball went out of bounds. If it went out on the baseline it was Leads call, on the sideline Center's (or what should have been Trail). The second problem sounds like the Lead might have been giving in to the Trail/Center's call and was asking for the ball so that they didn't have a long switch. If the ball was going the other way the Lead should have adminstered the throw-in as the new Trail and Trail/Center should have become the new lead down on the other end of the court.

2) When I am officiating it doesn't matter who is the Referee or an Umpire. Other than the beginning of the game and starting a new period. When questionable calls occur where the officials need to come together they should work as a team to get the situation resolved.

3) Hopefully they discussed the situation at a break. If I was involved I either would have mentioned that we messed up a switch, which is what the description sounds like to me. Or I would have discussed whose line is whose and that we should have discussed the call if we have a double whistle.

Hope that helps.