And yes, the key points for the Finnstep (and Quickstep, which is a different dance, for the Juniors) are in that document that golden411 linked.
Sequence 1
Key point 1-this is odd, since the steps are not sequential!
Lady & Man Steps 1 & 4 (XB-RF, XB-LF) and Lady Step 12 (LFO Tw1½ (Left Forward Outside one and a half rotation twizzle)
1. XB-RF: free leg crossed behind the skating leg below the knee (Cross behind to right forward)
2. XB-LF: free leg crossed behind the skating leg below the knee (Cross behind to right forward)
3. Tw1½: correct Turn
Keypoint 2
Lady Steps 20-21 (XB-LBO, XF-RBI/RBI Tw1½/RFO)
1. Tw1½: correct Turn
2. XB-LBO: free leg crossed behind the skating leg below the knee
3. XF-RBI: free leg crossed in front of the skating leg below the knee
4. Correct Edge (RFO) after Tw1½
Those guys better learn how to exit exactly in half a twizzle.
Keypoint 3
Man Steps 20-21 (XB-LFI, RFO-Sw3/RBI Tw1/RBI)
1. Sw3, Tw1: correct Turns
2. Sw3: correct swing movement of the free leg
3. XB-LFI: free leg crossed behind the skating leg below the knee
4. Correct Edge (RBI) after Tw1
Sequence 2:
Key Point 1
The first 2 will be easy to spot because not only is there a Closed Choctaw, there is a slide into a stop)
Lady Steps 32 & 33 (LFO Sw-ClCho, RBI/RBO/RBO Tw1½/RFI slide into stop)
1. Correct Edges
2. Sw-ClCho, Tw1½: correct Turns
3. Sw-ClCho: correct placement of the free foot
4. Sw-ClCho: correct swing movement of the free leg
5. Correct Change of Edge (Inside to Outside)
Key Point 2
Key Point 2 Man Steps 32 to 33c (LFO Sw-ClCho, RBI OpMo, LFI, RFI/RFI Tw1/RFI slide into stop)
1. Correct Edges
2. Sw-ClCho, Tw1: correct Turns
3. Sw-ClCho: correct placement of the free foot
4. Sw-ClCho: correct swing movement of the free leg
Key Point 3
Lady & Man Steps 64 & 65 (LFI XB-ClCho, RBO3/RFI Tw1½)
1. Correct Edges
2. ClCho, 3, Tw1½: correct Turns
3. XB-ClCho: correct placement of the free foot
I got one KP in the first sequence, and all 3 in the second, but they did not split the dance at the 35 step point, so I didn't guess them placed in the right sequences

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By the way, this ISU Communication 1728 confirms that the optional rhythams for senior are Foxtrot, Charleston, Swing.
and for Junior Foxtrot, Charleston