Factual error: A cordless nailgun takes about 2 seconds to recharge and cannot fire consecutive nails nearly as fast as depicted.
Factual error: The main character states that the photo plate of Lincoln has a crack in the precise location he was shot. Lincoln was shot behind his lower left ear and the bullet ended up behind his right temple. This is not the path shown in the picture.
Factual error: The bulk of the film takes place in and around June (the end of the school year), but dead leaves are rolling by with the gust of wind at the cemetery. It isn't Autumn yet, since the finale takes place 5 months later on Thanksgiving. (00:43:10)
Answer: A sickle is a harvesting tool with a crescent-shaped blade (with the sharp edge on the inside) as seen on the old USSR flag (along with a hammer). It's a reference to Death, who is most often seen dressed in black cloak with a scythe. On rare occasions Death has a sickle, but more often it's people confusing the two tools or thinking the words are synonymous. Plus, it's easier for some people to say "sickle" than "scythe." Ian is saying Death is on the ride.
Bishop73