I recently re-watched the first avengers, and I just noticed that Odin was watching the entire time. In the scene when thor snatches loki from iron man, cap and black widow after they apprehended him; thor lands somewhere in the forest and him and loki begin talking since all of asgard believed loki to be dead. However, odin's ravens Munin and Hugin clearly fly by listening to this whole conversation. You can say they were just random ravens, but I highly doubt this. We can then assume Munin and Hugin watched the whole fight between the big three and maybe even watched the whole events of the movie including loki being arrested. So Odin knew loki survived the whole time, he knew Loki was being influenced by a higher power(thanos) due to what loki said to thor in that conversation

Did anyone else notice this or am I just slow?