The events Morgan is recalling in this episode took place in Georgia, yet previous to this episode, he was in Texas. In "The World Beyond" series, it is said that all of the Mississippi bridges were destroyed during the outbreak. So, if they are back in Georgia, this is the second time Morgan has crossed the bridge-less river, and traveled hundreds of miles trailed by a woman in a truck and folks on horse back.
Towards the end of the episode, Morgan says that it has been 10 years since the onset of the zombie apocalypse. However, Grace and Morgan were both driving trucks. This is inconceivable because gasoline starts to go bad after a year or so. Therefore, unless somebody is refining petroleum into gasoline, all viable gasoline is long gone and nonexistent, rendering all motor vehicles inoperable.