Actually, it’s very easy!

1. Use the Selection tool to select either one of the frames.
2. Then (if you have the main story selected), click the out port (lower-right corner); or (if you have the endnote frame selected) click the in port in the upper-left corner. That loads the place cursor.
3. Click the place cursor on top of the other frame.

Here is more about threading frames together:

InDesign 101: Flowing Text

Hi Linda! Well… I suppose it’s possible, but not highly likely. Unless there were hundreds or thousands of objects out there.

There are so many reasons why ID can crash… outdated plug-ins, bad images, bad fonts, bad phase of the moon… 

The best way to do this would be to edit the original background image in Photoshop. The Content Aware Fill feature (or Content Aware Scale) may be able to help you extend the image to the size you need.

Actually, in this case it’s not needed. I do it out of habit.
Here’s where it comes in handy… given the sentence:
There are 1 (one) or 2 (two) options
And if you use grep to search for \(.+\) (which means “find everything between two parentheses) then it will find “(one) or 2 (two)” — that is, all the way from the first open paren to the last close paren.
But if you add the ? after the +, then it would just find “(one)” and then it will find “(two)”
So the ? sort of means “find the shortest amount of text that works.