No, poll workers do not have sufficient support mechanisms to deal with unanticipated technical issues on election day, because elections are very complicated. There are countless volunteers involved at many different locations. There are people everywhere, and if something goes wrong, a person cannot necessarily get there in order to help.
While this varies widely from state to state or even by county or cities, I don't think that for the most part this is true. In many cases, poll workers are left with a number to call for technical support that is understaffed and unable to cope with the call volume they are getting on election day.