If you saw the 2016 E3 gameplay, you'll find this Easter Egg great:

Remember the troll fight in the 2016 E3 gameplay? Of course you do. It fueled the hype-train. Because of it, you'll expect for the troll to burst through that bridge and interrupt Kratos and Atreus' first hunt... but it doesn't happen.

Instead, you can find a back way to the icy pond for some enemies and loot. After fighting off the wolves and draugr, Atreus will mindfully say: "I half way expected there to be a troll under this bridge". This caught me laughing.

I do not intend this to be a spoiler. Rather, I hope everyone finds the back door to this location for some combat practice, loot, and a good laugh. Carry on, Spartan!