While watching episode 5 (Wide Window part 1), I noticed the licence plate on the taxi was 67-7-63. Searching for this lead to this Reddit, which asks about them but is unanswered.
The plates listed are:
08-1-62 (Mr. Poe's car, from episode 3).
06-1-75 (Emily's car, from episode 3).
67-7-63 (Lake Lachrymose Taxi, from episode 5).
04-2-63 (Back of Lucky Smells Lumber Mill truck, from episode 6)
26-0-13 (Hook handed man's car, from episode 6).
04-2-82 (Front of Lucky Smells Lumber Mill truck, from episode 7) .
06-1-75 (Buddy’s Refridgerator Repair, from episode 7)
Do these numbers have any meaning?