Magnus Pym is left-handed, but when he meets Axel he carries his gun under his left arm. In #1.5, when the Berlin Cops wake him up in the morning, he takes his gun from the drawer and hides it in his left pocket (but puts it back again from his right hand).
When we see Magnus' father standing as a Liberal candidate at election, there are yellow party rosettes on display. At the time (in the 50s), the common party colour for the Liberal Party would have been green. Yellow only became common for the Liberals in the 1970s.