Back in "The Cloud," Neelix raged at Janeway for taking Voyager into a nebula that he would've steered clear of. In this episode, he reveals a bit of backstory to Tuvok that would help explain why he hates nebulae.
Janeway: So, how'd you do it? Told them fairy tales?
Neelix: Oh, no. Some of those stories can be very scary. Ogres and goblins.
I Have This Friend...: When Neelix asks Tuvok how long the particle-collecting procedure will take, he claims that he wants to reassure an on-edge crew. In reality, Neelix is the one who's on edge and in need of reassurance.
I'm a Humanitarian: The children (who are former Borg) suggest that after a catastrophe, the survivors of the Talaxian ship Salvoxia survived by turning cannibal. Neelix is obviously uncomfortable with the idea.
Mythology Gag: Tuvok snarking over cloud spotting is likely a reference to a Not Himself Spock doing just that in the TOS episode "This Side of Paradise".
Paris: Now, there's a creepy image. Reminds me of something out of Edgar Allan Poe. Kim: Looks like a vampire bat. You can make out the wings, even the ears. What do you see, Tuvok? Tuvok:Two Starfleet officers with juvenile imaginations. Paris: Come on, Tuvok! Haven't you ever looked up at the clouds and seen an animal? Tuvok: I will never understand the human need to find imagery in something as innocuous as a cloud.