Night Of The Living Dummy II - S1-E10
Visible crew/equipment: In a wide shot of Slappy about to smash the guitar on the parents you can see that he is propped up on a stand.
Chillogy (1): Squeal Of Fortune - S3-E19
Visible crew/equipment: Whenever people walk by cars, for example Jessica and Karl after they first meet, crew is reflected in them.
A Shocker On Shock Street - S3-E1
Visible crew/equipment: Strings are visible on the bats which attack Marty and Erin.
The Scarecrow Walks At Midnight - S2-E14
Visible crew/equipment: In one long shot, a scarecrow is shown walking past doors and windows, trying to break into the house. As the scarecrow nears the only open-draped window, the camera operator is reflected in it. The reflection appears for a short second, only to be blocked out by the scarecrow's bulky figure. (00:03:35)
Answer: According to all online sources I found, yes, this really was R.L. Stine.
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