A correction to your entry about the MUPPET SHOW book -- It's called THE MUPPET SHOW, not THE MUPPET SHOW (ON THE ROAD). It's an ongoing series, not a mini-series. The ON THE ROAD storyline was only in issues 1 - 3, and is collected in the ON THE ROAD trade paperback (which you list), along with issue #0, which I presume is included for the sake of completion. (That way, no issues of THE MUPPET SHOW are left uncollected.) But neither issue #0 nor the newest entry, #4, have anything to do with the ON THE ROAD storyline.
The 'zero' issue is not some anomaly or bizarre shift of numbering system, but is, in fact, a bit more common these days. Not all publishers use it, nor do those who do use it in all situations, but it is used by many publishers, including the major publishers (DC and Marvel), especially if they want to attract attention to a specific title.
A correction to your entry about the MUPPET SHOW book -- It's called THE MUPPET SHOW, not THE MUPPET SHOW (ON THE ROAD). It's an ongoing series, not a mini-series. The ON THE ROAD storyline was only in issues 1 - 3, and is collected in the ON THE ROAD trade paperback (which you list), along with issue #0, which I presume is included for the sake of completion. (That way, no issues of THE MUPPET SHOW are left uncollected.) But neither issue #0 nor the newest entry, #4, have anything to do with the ON THE ROAD storyline.
The 'zero' issue is not some anomaly or bizarre shift of numbering system, but is, in fact, a bit more common these days. Not all publishers use it, nor do those who do use it in all situations, but it is used by many publishers, including the major publishers (DC and Marvel), especially if they want to attract attention to a specific title.