Did Bill Weasley go to school with the Marauders?

No, none of the Weasleys were in school with the Marauders. Arthur and Molly were out of school before the Marauders even started. Molly herself says so in Goblet of Fire when she visits Hogwarts and seems interested in the Whomping Willow which wasn’t planted until after she left (it was planted to guard Remus Lupin).

Why did Snape recognize the Marauder’s Map?

Snape did not recognize the Marauder’s Map because he has never seen the map before. The marauders would never show it to him and he did not know about it to recognize it. There is no scenario which would lead the Marauder’s to show their map to someone they did not like – Snape.

How did Fred and George get Marauders map?

Fred and George give Harry Potter the Marauder’s Map Fred and George Weasley stole the map from Filch’s office in their first year at Hogwarts. They had been taken to his office for letting off a Dungbomb and saw a drawer marked “Confiscated and Highly Dangerous”.

How did Hagrid find Scabbers?

Discovered in Book 3, Chapter 16, Professor Trelawney’s Prediction. “Scabbers is found inside Hagrid’s milk jug. He scrabbles to remain inside the jug as Hermione tips it upside down, but lands on the table. He struggles when Ron picks him up.

Who was headmaster of Hogwarts during the marauders?

As far as I know it was Dumbledore. He became headmaster after Armando Dippet who taught til 1956 (atleast Harrypotter. wiki says). James Potter was born in 1960 so you can say pretty sure he attended Hogwarts from 1971-1979.

Does Snape know what the Marauders map is?

He tries to use it, and the map insults him by saying “Mr. Moony presents his compliments to Professor Snape and begs him to keep his abnormally large nose out of other people’s business.”. Just after that Lupin appears and takes the map from Snape. So Snape doesn’t know that Lupin in Moony.