Keen. I seldom pay attention to these things, thanks for noticing.
You are suggesting FTL communication and time travel jutsu, aye?
I think those over-sized tv's where just monitors(old-fashioned) because of the Chuunin exam. Obito came late because he helped an old lady, for which he earned a candy and a sermon from Kakashi. Hiruzen is telling Minato that he is to be the leader of this team.
Kakashi was the first to pass the exam. The trees, the leaves and the electric post/powerline(it looked ordinary to me, not a huge scroll) where just there to indicate passage of time while Obito tirelessly train to catch-up with Kakashi. Then finally, Obito passed the exam. A confidence boost that made him decide to give Rin flowers, then Rin told him Kakashi's promotion to Jounin and that they should bring him a present. (A heart breaker)
Minato's gift was the FTG Kunai.
Rin's gift was some special medical supplies.
Obito's gift was his sharingan.