Firefly vs Lightning bug

Some examples from the web:

• ...like a firefly lights up at night.
• My dad read by firefly as a kid,
• Firefly did a movie to wrap things up.
• His Excellency, Rufus T. Firefly.
• I thought we could take a ride to Firefly Hill.
• He begged the Fox network not to cancel Firefly.
• He owns Fox, and they cancelled Firefly.
• Roommates agree that Friday nights shall be reserved for watching Joss Whedon's brilliant new series Firefly.
• A Firefly with possible stolen goods on board.
• Alliance cruiser Magellan this is Firefly transport Serenity... ...requesting permission for docking.
• We need eyes on Firefly and Cobra ASAP.
• My first Comic-Con was because of "Firefly" 10 years ago.
• "Firefly" was a lot of firsts for me.
• And he expressed things in Firefly that couldn't have been done any other way.
• They took out a full-page ad thanking Fox and thanking the advertisers for supporting Firefly.
• Kind of like when Firefly was cancelled.
• When we think about actual use, you'll notice that Firefly has a single bassinet.
• Well that's why we have lights above and below the baby in Firefly.
• Remind me to give myself the Firefly medal for this.
• Then you didn't shadow Firefly?

Some examples from the web:

• The difference between the right word and almost the right word is the difference between lightning and the lightning bug.
• Mark Twain said that, The difference between the almost right word and the right word was the difference between the lightning bug and lightning.
• Actually, lightning bugs are in the beetle family.
• Y'all look out for the lightning bugs after sunset.
• She's got more spark then a barrel full of lightning bugs.
• No, those are lightning bugs.
• You know, like, if there's cool stars out, or... lightning bugs.
• They're cross fertilizing pears with apples and goats with sheeps, tobacco plants with lightning bugs-