Flag vs. Whistle and Flag, Linesman, NFHS

[johnyd]

I would Just like to go through all plays where a Linesman would have a flag only vs. whistle and flag, at the start of a play. Please add any I miss to the list and correct any errors.

1. Encroachment, both offense and defense = whistle and flag.
2. Illegal Motion, when one A player in motion moves towards the line of scrimmage prior to the snap. Flag, but NO whistle.
3. Illegal Motion, when two A players go in motion at the same time. Flag, (Whistle or not Whistle?) Who throws the flag and has primary responsibility for this? Referee or Linesman?
4, Other plays?

?Does a Linesman ever call the center for a snap infraction, or is that only the umpires responsibility? = whistle and flag.
?Does a Linesman ever flag and whistle a false start in the backfield? Or is that Referee only?