video settings

On the page for my video's settings where i can change the desciption, title, etc.., in the Advanced Settings page, there is the fields for: Date Recorded, Location, Language, Caption Certification, etc.. :P Does adding all this additional information help in any way to get the video more...

Do viewers of my videos see the annotations on them if they are watching my videos on a phone or ipad or something similar? I thought they did but I just told my friend who I'm sitting with to watch one of my video and he done it using his phone and I noticed there was no "Subscribe" annotations...

Do you allow your viewers to comment on your videos without needing you to approve the comments first before other people can see them? or Do you just allow the comments to be shown straight away as soon as they have been made?

When uploading a new video, or well editing one I suppose too, where it asks for "Video Language" to be chosen in the Advanced Settings page, does it mean the language as in Audio / Speaking? or is it meaning Text and Writing on the video also? For example, one of my videos doesn't have and...