Ovalorange
Good questions.
1. Route markers for clarity are clues that are general (Fast Forward, Detour, Roadblock, U-Turn, and Intersections are not route markers) and usually are to get teams from point A to point B.
They are usually in clueboxes along the race, but Phil does hand out one to each team at the beginning of a new leg.
***But the question isn't who is given or who gets the first route marker of the leg, but who reaches it. Meaning this question does not refer to Phil handing out a clue, unless he does so at some point after teams are released from the Pit Stop and before reaching the next Pit Stop.
Sign up sheets are not Route markers.... (though teams can be given route markers clues when departing or getting to a sign up sheet).
2. If Gary & Mallory are shown in any footage of the new leg then it yes would count. And since I use "leg" footage of them with "currently first place after Phil hands them their clue would absolutely count.
3. Since Phil mentions live on race footage (not edited voice over in Post) that Shelley Beach was in fact a Pit Stop. For the purpose of this game that was indeed the first Pit Stop of the race. The next Pit Stop, who knows.