Detroit was due for a bubble burst.
Two of their three highest USG players, Bradley and Harris had both shot over 50% on threes over the prior three games. Both are good 3PT shooters, but that was screaming for regression. Not sustainable.
So, naturally, they combined to shoot 2 of 12 from beyond the arc against LAL.
Add in the 1 of 4 on threes by Jackson and the 0 of 3 by Bullock, and that's 4 guys contributing to a 3 of 19 brick show from beyond the arc.
Some of this is 'let down' after the emotional win over GSW, but a lot of this is just regression. Detroit is probably a better team than the Lakers in the long run. But they aren't really as good as their current place in the conference standings would imply.