Empty rooms and slow moving dungeons

You how the players in your game always wakes up when you without hesitation give a name to a NPC, or suddenly mentions the look of a door in the dungeon?

I have been sitting in agony, trying to get a game moving again after I in passing mentioned some details of dungeon room that was in all other respects just empty. Naturally, if there's a description it has to mean something, right?

A suggestion for us all.

When describing a room in a dungeon, always mention one thing of dungeon dressing per room. 

If there's one item, smell or oddity in each room, they will have to consider it all.

Should this lead to games where everything is examined for 15 minutes and the players insist on rolling some ability to find the clue, then just drop a piano on them. Yeah, in a dungeon. Go ahead.