Yvonne De Carlo, who portrayed Lotta Crabtree, was about 37 at the time of this episode, the real-life child actress Lotta Crabtree would only have been 11 or 12. (At the beginning, the series was set in 1859.)
The cast sang the lyrics for the Bonanza theme in a scene to run at the end of the fourth act. However, it was so laughably ridiculous that it was cut and never made it on the air. This outtake featuring the Cartwrights' warbling has been shown since, but not as part of the series.
Adam makes a crack to Joe about "Your French Quarter mother" and the two get into a fight. In future episodes the topic comes up again. What is Adam implying about what Marie did before she met Ben?
For the first 10 episodes, the ending credits were scrolled over the familiar Ponderosa map with a (very) slightly different instrumental version of the Bonanza theme.
Lotta Crabtree (1847-1924) When Bonanza began, the year was 1859, thus making Lotta 12-13 years old at this time. Even though she had started her career as a singer and dancer she would've been too young for even Joe Cartwright to consider.