Yes personally I think the sig is definitely a compelling marker. Especially after the patch that caused them to not be completely random anymore. Plus the fact of time. I have had a static that I did not warp to last upwards of a week. If in fact it was active it would have had the normal 24 hour timer.
Interiors for The Waltons were filmed on Stage 26 and Stage 20 of The Warner Bros. Studio which was known during the original series as The Burbank Studios.
Reason #2: Walton's Mountain school was in fact a church that is is located on one side of this set. The church actually played the church at the end of Season #1 in The Easter Story when Olivia was stricken with Polio (but we're not supposed to notice that fact.)