I tweeted the writers about the watch and they said to think back to when House got the watch. The watch House was wearing up until "Now What," was the watch that Kutner gave him for Christmas, which I believe he started wearing after Kutner died. The one he is wearing in "The Dig" is a different watch. Is it possible that there are multiple timelines going on?

Thirteen did mention Lucas in "The Dig." That might have just been to illustrate how long she had been gone (because she leaves in "Now What" and House's team doesn't find out until the following episode that House and Cuddy are dating), or to increase the shock value of her finding out that House was dating Cuddy. I'm unsure of what it could mean though. It's possible that the mention of him was more significant, maybe indicating some sort of discrepancy in the timeline.

Also, last episode, was Cuddy mentioned by anyone other than House? Or was the relationship between House and Cuddy mentioned at all by anyone other then House?

I'm wondering about what all have been hallucinations this season and what haven't...

I'm wondering if the new watch is indicative of the start of a new timeline...

Random thought, but is it possible that instead of Cuddy finding House in "Help Me," he actually took a bunch of Vicodin, hopped on his motorcycle, drove to Cuddy's house and crashed in front of it?