Although on the pi, I saw lots of messages saying it couldn't connect to 978 something (forgot since I've already closed the pi browser).
Wondering if I should worry about it or leave things as is?
You have said yes (y) to option to install dump978-rb. This requires plugging in RPi another dongle with its own antenna. Since you did not provide dump978-rb its dongle, it stsrts giving error messages.
Remove dump978-rb by following command
sudo apt-get purge dump978-rb
sudo reboot
.