Solution:

It's in the beer mug

Solution:

Read the question carefully again. New Year do falls after Christmas but that happens if two different years. The question is put up against the year 2050 and thus there will be 51 weeks and 2 days in between them as New Year will appear on 1 January 2050 and Christmas will happen on 25 December 2050.

Solution:

Kid1, he was left with one rock.

Solution:

The Winchester brothers - sam and dean

Solution:

It can be done as shown in the picture below.

Solution:

The Password.

Explanation:
Clues 2 and 5 are correct and rest are lies.

Solution:

192 021

If you look at it as two-digit numbers you'll see:10 11 12 13 14 15 16 17 18 19 20 21

Solution:

See the figure for the answer. Wasn't it a bit tricky?

Solution:

457730 * 4 = 1830920
(DOLLAR * 4 = QUARTER)

Solution:

Four

As the window was closed it is obvious that the six candles that were not extinguished were lit till they melted away entirely. Thus only four candles that were extinguished remain at the end.

Solution:

192

Explanation:
I started with the number 192.
Adding the reversed 291 to 192 gave me 483.
Similarly,
483 + 384 = 867
867 + 768 = 1635
1635 + 5361 = 6996