Not unreasonably, everyone is assuming the scene we saw during Andy's meeting with the Fireman involving Lucy will be very meaningful/significant to the overall plot.
I don't necessarily think so.
Perhaps when Lucy and Andy were browsing the furniture website in an earlier episode, they each ordered a different chair and Lucy being Lucy, she is overreacting to having to choose between the two chairs?
Another trivial meaning to the scene we saw could be in relation to Lucy's fear of mobile phones. While not the type of mobile phone that most would think of upon hearing the term, an office phone that is mobile/handset (see example in spoiler below) may be installed (or was installed, if it is a flashback) at Lucy's desk, causing her anxiety.
Alternatively, she's seeing Good Coop back in the Sheriff's Department for the first time in 25 years and while nonplussed by that fact, focuses on a mobile phone he is holding?
One flaw I can think of with this theory is would the Fireman show Andy something so insignificant? Or maybe the Fireman doesn't give the people he meets new information, but somehow encourages them to think for themselves, to delve deep into what they already know and predict what will happen in the future (in this case, Andy might foresee the two chair scenario)?