Suitcase cracked me up
I loved it when he found out that the suitcase had a handle, and from then on he literally dragged it everywhere.
I like it as a piece of comedy but also as some social commentary, I'm only 22, but I still remember a time when suitcases didn't have wheels and we actually had to carry our luggage.
A comedy from England called 'Peep Show' summed it up in a scene where it says a real man "doesn't let the earth carry his stuff", so funny.
I took it also as Frank's bewilderment with the modern world, like how he uses landline as oppose to mobile. I enjoy finding things like this in movies, it makes them feel as if they were made for you.