Skyrim's a truly large game, but Bethesda was ready to make it even larger, with plans in the works to add in more quests, locations, features and NPC's that had to be abandon mid-development. Here's another look at 5 pieces of cut content in The Elder Scrolls 5.
The Skyrim "Opening Scene Overhaul" mod will restore much of what was cut from the opening scene, and the "Cutting Room Floor" mod adds in many instances of cut content. Both were used in this video.
Skyrim Original Opening Scene Overhaul: http://www.nexusmods.com/skyrim/mods/77027/?
Skyrim SE OSCO: http://www.nexusmods.com/skyrimspecialedition/mods/168/?
Skyrim Original Cutting Room Floor: http://www.nexusmods.com/skyrim/mods/47327/?
Skyrim SE Cutting Room Floor: http://www.nexusmods.com/skyrimspecialedition/mods/276/?