HP Questions Upon Re-reading: Book 1 Chapter 4 & 5

Was Hagrid’s coat enchanted with Extension Charm or made from the fur of a magical beast? Despite having a huge coat due to his size, it just doesn’t seem possible to stuff a kettle and poker, some food including a box of cake, a living owl, and even some dormice in it. All of them inside different pockets and not stuffing or suffocating the animals.
Was Aunt Petunia notified about the true cause of death for her sister? She described Lily died for being “blown up”, which is far from the truth of falling to the killing curse. The content of the letter that Professor Dumbledore delivered will remain a mystery. We might be better off imagining the facial reaction of the surgeon responsible for removing Dudley’s pigtail and his medical record.