So, a Position property having an expression of wiggle(2,20) will wiggle twice. The first number is the number of wiggles per second, i.e., frequency, and the second number is the amount of wiggle, i.e., amplitude. wiggle(2, 20) The numbers within the parentheses specify the wiggle. How did you build that static? If it involves Fractal Noise, make sure you look in the effect settings - under "Evolution Options," there's actually a checkbox that lets you cycle the evolution to make perfect loops. Now, let's see how to use wiggle expression in after effects. The TV seems like the only lingering thing. The moon's current movement will never loop cleanly, unless you make this MUCH longer. One important thing you likely already know - your last keyframe should actually be one frame PAST the end of your loop, to avoid a pause. If you have the ability (in terms of allowable file size), you can make the loop longer, giving yourself more leeway, or let some elements loop 2x in the time others only loop once. Getting things to all line up at the same loop, without looking like they're all moving at the same speed. Since you're just worrying about the loop, it saves you a lot of wasted preview time. Yes, using expressions can make that trickier! A trick I've found to help find those perfect loop points is to drop your comp into another comp, and get that end/start lined up like this. The floating ball and waving plants - you just need to dial those in so they match the loop length. Since your wiggled elements (spiky plants) are lower-frame-rate, I wouldn't stress about those - the jumpiness hides any loop issues, to my eye. It looks to me like you just need to sync things up.
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