Question about some lines of a sitcom
I'm watching a old sitcom called The Golden Girls. There's some lines I can't understand.
1.
Dorothy：Morning.
Rose：Oh, here, taste this. It's my special maple syrup, honey, brown sugar, molasses, Rice Krispies log.
Dorothy：How practical. A snack you can panel your den with.
What does “A snack you can panel your den with.” mean？

2.
Blanche：Just look at this man. He is obviously guilty as sin. I don't even know why they bother with a trial.
Rose：What trial?
Blanche:Oh, the Duncan Osgood trial. That big society murder over in Palm Beach.
Rose：What makes you so sure he's guilty?
Blanche：His wife was found at the bottom of their private lake clutching his dickey in her hand.
When Blanche is saying"clutching his dickey in her hand." there is so loud laughter. I don't know why this sentence was supposed to be laughing.

3.
“But I'm begging you, while we're sleeping together, please lay off the broccoli at dinner, huh?”
Why can't eat broccoli? I rarely eat it so I'm not sure why.

Question

Question about some lines of a sitcom
I'm watching a old sitcom called The Golden Girls. There's some lines I can't understand.
1.
Dorothy：Morning. 
Rose：Oh, here, taste this. It's my special maple syrup, honey, brown sugar, molasses, Rice Krispies log.
Dorothy：How practical. A snack you can panel your den with.
What does “A snack you can panel your den with.” mean？

2.
Blanche：Just look at this man. He is obviously guilty as sin. I don't even know why they bother with a trial.
Rose：What trial? 
Blanche:Oh, the Duncan Osgood trial. That big society murder over in Palm Beach.
Rose：What makes you so sure he's guilty?
Blanche：His wife was found at the bottom of their private lake clutching his dickey in her hand.
When Blanche is saying"clutching his dickey in her hand." there  is so loud laughter. I don't know why this sentence was supposed to be laughing.

3.
“But I'm begging you, while we're sleeping together, please lay off the broccoli at dinner, huh?”
Why can't eat broccoli? I rarely eat it so I'm not sure why.

Answer

1. She is basically saying that the snack is woodlike (hence, can be used for paneling). It may be because the snack is tough or involves tree derived components, or both.
2. Dickey is a false shirt.  If his wife was on the bottom of the lake with his dickey, that would mean she had grabbed it off him when his was pushing her into the lake.
3. Not sure, but it might be because high fiber food such as broccoli make one prone to gasses.

Answer

OMG, I don't know if I'm the only one old enough to remember the show, but trust me; at least half of the dialogue was innuendo and if it involved Blanche - it was definitely meant to be a reference to his penis.  This character invented the idea of women of a certain age on the prowl...

(A dickie bow, is a type of tie, older men wore.  They are no longer fashionable unless you're a make stripper.)

Answer

I agree with the other replies about 1 and 3. The dessert is so solid and sticky that you could decorate your walls with it, and broccoli can have an embarrassing effect on your digestive system.

And while the tone is still fairly low, I'm sure that the laughs around 'clutching his dickey in her hand' were because it's suggestive of the man's (possibly disappointingly small) genitalia.

Answer

1.  Dorothy was making a joke about wood paneling since Rose's dessert was called a log. Wood paneling used to be a popular material to cover walls with. A den is an office or study. 
2.  I'm not sure why this is funny either. Maybe its because of the word "dickey," which is kind of like a fake shirt that you wear underneath a sweater or jacket. Dickey can also sound like a vulgar way of talking about a man's private parts. 
3.  Broccoli gives some people gas.

Answer

"A snack you can panel your den with" meaning that the snack is so sticky she can stick those snacks to the wall of the den like wall panels.

I dont know what they mean by "dickey"

Broccoli can give people really bad gas