Seasons from 2009-2013 feature the "original" intro sequence, which shows members of the Harrison family around the shop, showing off and handling a number of items the shop carries (including Confederate money.) This intro is noteworthy in that it does not at all feature Chumlee (as it is unlikely the crew knew how popular he would become at the time.) Starting mid 2013, a new intro sequence began airing, with an instrumental by Lynyrd Skynyrd serving as the theme music. It features the 4 main cast members (including Chumlee) walking down a Vegas street together, and ends with them standing on the Pawn Shop roof.
Early episodes "play it straight" in the "this time on Pawn Stars" segments at the beginning of the show, showing what will be sold/traded/etc. on the show. However, in more recent seasons, this has become more of a "joke" segment, and features outtakes or funny scenes that aren't in the actual respective segments (cars not starting, comical dialogue, things going wrong, etc.)