Laura and Steve share a romantic moment, but it is never mentioned again, not even when a romance plot is introduced in the last season.
After Nick tells Carl that he has to move his fence from his property, Carl says that his fence has been in the same place in his backyard for 15 years. But in season 2's "Son", Carl and Harriette gave birth to Eddie in 1974 which was 22 years ago and later in next season's "Father Time" Carl tells Steve he bought their house on March 8th, 1976, which was 20 years ago at this time.