When Hershel and Rick drive up with Randal he is not wearing a blindfold, but when T-Dog points out Randal he is wearing one.
When Rick takes off his shirt, there is no scar on his shoulder where he was previously shot.
At the end of "Nebraska," Rick guns down two thugs from Philadelphia in a tavern. There's bright daylight outside at the time, streaming through the windows, and, according to the episodes' time-line, it should be some time in the afternoon. At the beginning of "Triggerfinger," though, when these events are recounted, it's shown to be dark night outside.