I liked this episode a lot. The marbles thing was good fun, and the Claudia/Jinks and Artie/Fr. Data stories are getting really good.
I had one question though.
Did I imagine this, or when Fr. Data came to Artie originally about the astrolabe, didn't he says that someone used it to go back in time 24 hours? Did I imagine that?
If not, how did he know that? Wouldn't he have reset along with everyone else? Even when he found the item missing, how would he know how far back the thief went with it?