When we see Clark Kent growing up, he seems to be in the mid-50's (style of cars, "Rock Around the Clock" playing). However, later in the movie Lex Luthor states Krypton blew up in 1948. So Clark would have been in high school from approxmiately 1964-1966: the Smallville scenes are way out of sync time-wise. In fact, Superman III says he graduated in the class of '65.