In my campaigns, I generally only have silver and gold pieces. B2 assumes that all five coin types will be used which makes experience tabulation a nightmare. Annoying.
Second, I gave the characters several hundred points of experience for good ideas and role play. The standout events were Solvo playing dead in the ogre's lair, the removal of the ogre's body to a fake campsite, the cleric praying for the ogre and the whole party using the secret door to ambush the orcs.
In most of these cases, a single player or character came up with the idea and should have reaped the reward. The way I handle this under play conditions is to put a number on an index card and hand it to player. These points can be added to their experience immediately, unmodified by attribute bonuses OR if they wait to the end of the session, they can add in their experience modifier. This didn't happen because we've been playing outside with just the DM's Guide and Player's Handbook as a reference.
Character Sheet for AD&D