In prior years (back to Turbotax for DOS ?), Forms Mode would allow the user to locate errors in a tax return.
This functionality has been deleted in Turbotax Premier for 2008.
Searching the Help Topic, find two different Topics seemingly on point
#1 -- "ERROR ALERTS"
#2 -- "REVIEW ERRORS IN FORM MODE"
But with differing results --
"ERROR ALERTS" describes the functionality from prior years, stating