Marauder's Map/Time Turner in POA

[chappysmom]

No: HPFGUIDX 91404

One question (okay, two):

In POA, since Harry and Hermione repeated the three hours before 
Sirius was captured--wouldn't they have appeared on the Marauder's 
Map TWICE? When Lupin saw the map in his office, why didn't he see 
the Harry & Hermione lurking outside as well as the ones who went 
into Hagrid's hut with Ron?

And, two, since Snape saw the Marauder's Map himself, why didn't he 
see Peter Pettigrew on it?? (Unless the Shrieking Shack is off the 
edge of the map and Scabbers was already beyond the border when Snape 
saw the map? That's the only explanation I can think of, although 
don't I remember him seeing Sirius and that's why he knew Lupin was 
going "to" him?

Thanks, and sorry if this has been brought up--the archives are huge 
and I could have missed it!

Deb in NJ